FULL SUMMARY:

Midoriya Izuku had been promised at the age of four to his once dear friend, Bakugou Katsuki. Their mothers thought it smart to betroth the two in the hopes that Izuku would be protected and taught in the safety of the guards Mitsuki could provide until the day he was old enough to come to the south kingdom. After all, it was not everyday that the rarity of a male omega was born within these times.

Izuku grows up knowing he is promised, and has vague memories of his alpha from his younger days. He is also gifted, in more ways than one when his teacher Toshinori confronts his mother with Izuku being named as his successor. But a war breaks out between the kingdoms of the north and east, and the betrothed are separated far longer than the royal family would have hoped. But the war raging keeps them separated besides a few letters that are received from those that were brave enough to run through the war lands.

NOTES:
So I know I should be working on Hidden in Plain View and all that, but this story came to mind and I just could not help but write about it? I hope you all understand!

I haven't seen very many (as many as I would like lol) stories of ABO Dynamics in the BNHA fandom, and wanted to take a stab of my own at it. So here it is ! A BakuDeku Alpha/Beta/Omega Story with a royal twist from that beautiful third ending we were gifted from the anime 3

I also gave it a go at a unique writing style/wording so let me know if you enjoy this type of writing style! It was fun to give it a try XD

Hope you all enjoy!

"Are you sure? He's still just a child… I'm not sure if-"

"No, I'm sure. He will be the successor."

"But, All Might he's… He is so young? And you know what the society thinks of male omegas… They will never-"

"They will learn. Times are changing. He was chosen."

"I don't, I don't agree to this. He's my little boy! This responsibility, it is much too great for just one child to take on alone!"

"He won't be alone. He has been promised, yes? To protect him later in life?"

"Y-yes, to a dear friend of mine, but she's in the kingdom three days travel from here. Her son, he's an alpha, and they are friends, but we-"

"It will do well, to have that marriage when the time comes. The two boys are compatible, they have met?"

"Y-yes, All Might."

"Very good. It will make due for an alliance later on when he is announced as my successor. The people will come to love him, Inko."

Inko had promised her only child when he was at the age of four. Her son, Izuku, a rare male omega would grab a lot of attention as he grew older, and his cycles would hit. The smell of an omega could be overwhelming, and few new of the scent from a male omegan, but from what she had heard, there might be much to fear if she couldn't protect her young boy when his heats hit.

She had gifted his hand to her dear friend's son, a loud, angry blonde who was everything his mother was and more. Inko and Mitsuki had become fast friends, even through the miles and kingdoms that separated them. They had met at a festival in the grand capitol, the two becoming stuck to each other's sides, and their mates had an understanding that this wouldn't be just a passing friendship for the week long celebration.

Bakugou Mitsuki was a loud, compulsive, and rather extravagant alpha women, married and mated to her beta husband who complimented and completed her. Where she took charge in power and strength, Masaru stood as a solid force behind her, words of wisdom from his days a warrior within his own tribes to the west. The two had been arranged at a modest age when Mitsuki was named the heir to her own throne. The Kingdom to the south having multiple female alpha rulers, and Mitsuki would no doubt stand above the rest. It was an odd pairing, since a female alpha could both impregnant and give birth, but normally only through another alpha's seed. Masaru and Mitsuki had a hard time conceiving, but eventually had been able to conceive and give birth to their only son - an alpha named Katsuki.

Inko had first been hesitant, when Mitsuki approached her with the idea to have their boys betrothed. The first time had been just after they both had found out they were pregnant. Mitsuki, having a few miscarriages before she took, was a few months ahead of Inko in her pregnancy. She never gave her body any rest, even when the kingdom was in good hands with Masaru being in charge. Inko had come to visit, having just found out a few weeks before that she was to give birth to her first child as well. Mitsuki had laughed, her body glowing with a healthy pregnancy as she breathlessly told Inko her plan.

"It would be something if they were to be promised, no?"

Inko had been startled at first, her hand resting over her slight bump as she hummed in thought. "It would be, yes."

"Then should we?"

"Mitsuki! We are both hardly along! There is no sense in promising something that may never be."

Mitsuki had only laughed at Inko, her cheeks rosy as she glanced down at her larger stomach. "I have a feeling my son will become a great alpha leader. I just know it." Inko remembered how Mitsuki's eyes had rested on her own bump, her hands pausing in their caress as she nodded towards Inko. "They will be known across the nations as the greatest pair."

The next time she had expressed her interest in promising the two was when they were barely two. Katsuki had just begun to walk, a few months older than her dear Izuku, who was still only crawling. Katsuki had been babbling towards Izuku, who looked on with interest and gave his own insight here and there. Inko was invested in watching the two and missed when Mitsuki had said something.

"Inko? Did you not hear me?"

Inko looked up from her son, missing the small movement as Izuku crawled behind Katsuki towards the couch where the other had patted the cushions with aggressive swipes.

"Ah, I apologize. I was invested in what they boys were talking about. They seemed very interested in something."

Mitsuki grinned as she turned her eyes to watch the two boys once more. "Yes, I agree. They seem to be conversing in their own language. What do you think they are saying?"

Inko could only hum in reply and she glanced back down to where her son was previously. Her eyes growing nervous before she spotted him standing, using the couch as support beside Katsuki against the far wall. Her young boy talking tiny steps with the guidance of the other two year old who babbled away. Katsuki's hand seemed to be ready and tense at his side, guiding Izuku who was taking tiny steps, his one hand holding onto the couch cushions while the other gripped Katsuki's one outstretched arm. Izuku had the biggest smile on his face. His eyes seemed to shine like tiny emeralds all the way over towards the mothers.

"You see what I mean? The greatest pair Inko. I can just see it."

"Mitsuki, please, they are only two…"

"But look at them Inko. It was meant to be. Katsuki, my brash alpha son, so much like me in every sense a son could be. And your son, dear Izuku, a rarity in everything that an omegan stands for. I wish for it so badly Inko, can't you see?"

"I do see, truly I do, but… I have my fears Mitsuki. Hisashi has just left us, and Izuku, he is all I have. You must see why I am so hesitant?"

Mitsuki's face had grown hard at the mention of Hisashi, her distaste evident in her scowl. "Don't speak of his name here. I still have search hounds out for him."

"Mitsuki, please call them back! It has been months, and I grow tired of the hope that he would one day return. It was too much for him to bare when Izuku was born. You know how hard it can be…"

Mitsuki still shook her head at Inko's words, her mouth set in a hard line as she glanced at the now slowly walking Izuku. "He still should not have abandoned you. That is why I wish this so dearly, for then you and Izuku, the dear one, would be well protected."

Inko could only smile at her friend's words, her head nodding in agreement before she smiled down at the two boys who were making their way over towards them. "Oh my! Izuku my dear boy! Just look at you taking big steps! And Katsuki! Ever such the strong leader and teacher!"

The two boys' smiles that she was given had lifted her heart from the cold clutches it was slowly seeping into.

The third time the betrothal was given word was when they boys had met again at the age of four. Izuku had hidden behind her leg, his head poking out behind her as Inko bowed politely towards Mitsuki, Masaru and Katsuki. Katsuki stood proud at his mother's side, his red eyes glancing over Izuku with thought before a toothy grin was given his way. Izuku had made a strange noise behind her, before Inko let out a soft huff of content and turned towards her son.

"Izuku, my dear one, these are the Bakugou's. You have met them numerous times before. Do not be afraid." Izuku's large green eyes settled on her before he nodded and stepped forward, his hand not leaving his mother's grasp.

"Oh Inko! His freckles look marvelous! They have filled out his face so well!" Mitsuki moved forward, kneeling down to Izuku's height as she studied him. She ruffled his hair fondly, to which she was granted a large smile from Izuku. "My, my. The ever cute one aren't you, dear one?"

A snort from behind her caused her ears to turn red as she glanced at her son. "Katsuki. Step forward."

The young alpha seemed to freeze in fear before his father bumped him forward. Katsuki came to stand next to his mother, his height a slight inch taller than Izuku who looked up towards Katsuki with a great curiosity. It seemed Katsuki had the same interest, but greatly tried to hide it to no prevail.

Inko's eyes settled over the two, her nervousness evident in the way she wrung her hands in her long skirt. The three conversed, and it seemed as if the boys suddenly realized that they were once great friends, and the two took off running for the nearby courtyard. Inko glanced at Mitsuki, who had a knowing smile on her face as she looked back up at Inko.

"Come Inko. Let us discuss this over tea."

Mitsuki was determined to give Katsuki the chance she never had - to grow up being able to come to love the one he was meant to rule alongside. Not to say she didn't love Masaru, not the case at all. But they had been promised later, a time after a normal betrothal was given. It was rash, and happened quickly for an alliance between the west and the south. Masaru had been a great commander in their small scuffles to the west, and the Bakugou royals had extended their hands to help aide with the raids in exchange for the leadership and wisdom Masaru could bring to the throne. Mitsuki had been reluctant at first, but come the time, she had gifted her wrist to Masaru who flashed his neck to her.

A compatible pack was made that day, and Mitsuki learned to come and cherish her husband and his more quiet mannerisms. She, like most mothers, just wanted the best for her child, but she also knew she could not pass up the chance to gift her kingdom the rarity that was a male omega.

Inko's son had been a gift unto this world that her blasted husband Hisashi could not see. Mitsuki wanted to cherish the young boy for all he was worth, and give him the rightful place as her son's right hand she knew he could be. Inko's life had been left to struggle after her husband left them. It had not gotten out yet that a male omega existed within the fair lands of the center, but Mitsuki had no doubt that once Izuku started schooling, and even worse, began his cycles, that word would get out to all the lands.

She had to strike, not only for the chance at her son's happiness, but for the protection that she could provide young Izuku and her dear friend. It was obvious in the way the boys interacted that they were compatible, even at a young age. Katsuki's alpha already showed interest in leading, guiding and teaching the younger omega. His bouts of rage also were calmed when around Izuku. Izuku himself seemed to be of a gentler nature. His eyes saw much more, and he was quick thinking and seemed to analyze more even at his young age. Mitsuki saw a great tactile leader in him, and wanted to put his mind to work.

"Have you thought over what I sent in the letter?"

Inko looked up towards Mitsuki, her hands once more gripping her loose skirt in nerves. "I have."

"And?"

"I think I could agree to the terms. Izuku, he needs the protection, I fear that word is beginning to spread in the center of what he is. The private teachings would be wonderful, to avoid interest while in school."

Mitsuki grinned as she looked towards her husband, his own smile smaller but he reached out for her hand nonetheless to show his support. "Then it shall be! Iida, please grab the two boys, we need to discuss with them something important."

"Right away my Lady."

Quickly a scuffling was heard, followed by laughter of the brightest kind as the two boys fell into the room. Inko held back a giggle, seeing their disheveled forms, and a look of exasperated fondness filled Mitsuki's features. The three adults brought the two boys into a small washroom, and cleaned up the little they could before walking into the memorial hall where many pictures filled both sides of the room. Some were of single people, others of full families and Mitsuki stopped before her own portrait, the portrait of Masaru hung across from her and a single family photo sat to the right of him.

"Katsuki, my son. Look upon these three pictures, what do you see?"

Katsuki looked between the three photos, and then glanced at the ones further down the hall. "I see you, old hag, and the old man too. And there I am! Look Deku! You see me there? Don't I look magnificent!?" Mitsuki had to hold back a scowl as Inko's laughter filled the hallway space and Izuku's large 'wow' was heard by all.

"Amazing Kacchan! You look like you belong up there like the rest of your family!" Mitsuki paused, and kneeled down besides the two boys, but her eyes settled over Izuku.

"Dear one, what would you say if I told you you were to be up there someday as well?"

Izuku's eyes widened as he glanced from Mitsuki to his mother to Katsuki, his eyes slowly gaining a look of realization. "I am… I am to become a royal? But my blood - I am not-"

"Shh, shh, my dear one. You are very smart for your age, are you not?"

Izuku nodded, his eyes looking over towards his mother who gave him a gentle smile. "I am. Yes."

"So, can you guess as to how you will be up there someday?"

"Am I to be promised?"

Mitsuki's smile gave him a slight bit of courage as he glanced to Katsuki, who was looking at him with wide eyes. His look gave Izuku pause as a sudden thought crossed his mind. "I'm to be promised to Kacchan…?"

A small snort left the small alpha as he looked away from Izuku, Izuku's spark seemed to fade from his eyes as he watched the other young boy point at his ancestors that hung on the wall.

"You see these leaders Deku? They all lead this great kingdom with strength and courage, something I have within my small hands already, but you lack." He paused at his mother's sharp look but continued, ignoring the tears gathering in his friend's eyes. "I already belong up here, and to be my promised you must have to work extra hard to be at my side when the time comes. Not just anyone deserves to be a royal Deku. You understand?" Katsuki turned back around, standing underneath the blank space to his mother's left that he would one day fill when he takes the throne.

A sniffle was heard before Izuku's voice filled the hallway. "I promise you Kacchan… I'll become one of the best leaders this kingdom has ever seen. I'll make you, my mother, and everyone else proud to know who I am. The rarity, I will be!"

The promising continued down the hall, where the two boys were taught to produce liquid scent from their wrists, and pressed the inside of their wrists to other's neck. The first scent marking was made to be a sort of first connection, where the scent of the other would last, and their secondaries would hold onto that scent as a marking of 'mate'. This was established to form a small bond, where if ever separated, the other would be able to know who the other mate was within a large crowd, even after years apart. The smell would fade, but the secondaries would always know in the end.

Katsuki grinned down at Izuku, who his alpha now screamed out at him as 'mate'. His alpha seemed to already think that Izuku was worthy, and that they should shield him away from the rest of the world, but he did not give much thought to what he was saying. He instead took in Izuku's features at the omega did the same.

Izuku smiled up at his dear friend, his omega purring in delight at the union. His alpha was already strong, and he knew he would grow to one day rule this fair kingdom alongside his alpha. The alpha to his omega.

Izuku was gifted a small pendant which held within it the scent of Katsuki. The pendant was made of blazing ruby within the shape of the Bakugou crest. Anywho spotted the pendant would know that Izuku was under the south kingdom's royal protection, and was to not be harmed. Inko was also given something similar.

A few days later, Inko and Izuku set off back home, Izuku waving towards Katsuki as they set out from the castle with a larger caravan than they had arrived with. A few of Mitsuki's most trusted guards and teachers with their families, were sent with the Midoriya's with the hope that they would protect and teach the young future ruler under her order.

It was a good thing that she had sent extra protection as well, as a large scale war set out over the kingdoms just days after they left. The central caught in the mix as the north and east fell into dispute nearby. Mitsuki soon lost contact with Inko, the letters far and few between, but promised of safety and to respond soon.

She could only hope that Inko would keep the promise.

End Chapter 1